From
IL General Assembly's website
"(a) A person commits disorderly conduct when he knowingly:
(1) Does any act in such unreasonable manner as to alarm or disturb another and to provoke a breach of the peace; or
(2) Transmits or causes to be transmitted in any manner to the fire department of any city, town, village or fire protection district a false alarm of fire, knowing at the time of such transmission that there is no reasonable ground for believing that such fire exists; or
(3) Transmits or causes to be transmitted in any manner to another a false alarm to the effect that a bomb or other explosive of any nature or a container holding poison gas, a deadly biological or chemical contaminant, or radioactive substance is concealed in such place that its explosion or release would endanger human life, knowing at the time of such transmission that there is no reasonable ground for believing that such bomb, explosive or a container holding poison gas, a deadly biological or chemical contaminant, or radioactive substance is concealed in such place; or
(4) Transmits or causes to be transmitted in any manner to any peace officer, public officer or public employee a report to the effect that an offense will be committed, is being committed, or has been committed, knowing at the time of such transmission that there is no reasonable ground for believing that such an offense will be committed, is being committed, or has been committed; or
(5) Enters upon the property of another and for a lewd or unlawful purpose deliberately looks into a dwelling on the property through any window or other opening in it; or
(6) While acting as a collection agency as defined in the "Collection Agency Act" or as an employee of such collection agency, and while attempting to collect an alleged debt, makes a telephone call to the alleged debtor which is designed to harass, annoy or intimidate the alleged debtor; or
(7) Transmits or causes to be transmitted a false report to the Department of Children and Family Services under Section 4 of the "Abused and Neglected Child Reporting Act"; or
(8) Transmits or causes to be transmitted a false report to the Department of Public Health under the Nursing Home Care Act or the MR/DD Community Care Act; or
(9) Transmits or causes to be transmitted in any manner to the police department or fire department of any municipality or fire protection district, or any privately owned and operated ambulance service, a false request for an ambulance, emergency medical technicianambulance or emergency medical technician paramedic knowing at the time there is no reasonable ground for believing that such assistance is required; or
(10) Transmits or causes to be transmitted a false report under Article II of "An Act in relation to victims of violence and abuse", approved September 16, 1984, as amended; or
(11) Transmits or causes to be transmitted a false report to any public safety agency without the reasonable grounds necessary to believe that transmitting such a report is necessary for the safety and welfare of the public; or
(12) Calls the number "911" for the purpose of making or transmitting a false alarm or complaint and reporting information when, at the time the call or transmission is made, the person knows there is no reasonable ground for making the call or transmission and further knows that the call or transmission could result in the emergency response of any public safety agency; or
(13) Transmits or causes to be transmitted a threat of destruction of a school building or school property, or a threat of violence, death, or bodily harm directed against persons at a school, school function, or school event, whether or not school is in session."
1--causing a ruckus in public
2-4--intentionally sending false alarms to cops or first responders
5--peeping tom law
6-12--intentionally sending false alarms/reports to other public agencies
13--Threatening people/buildings at school
None of these seem to fit.
Perhaps section 13 might, if the kid's list included threats. But if it was simply "ratings"--however vile, crass, or offensive those rankings might be--it does not fit the simple reading of the IL law. (IANAL, but you can read the law for yourself.)
I think this kid ought to be publicly ostracized by parents and mentors, and as appropriate under school disciplinary codes. But there seems to be no basis for the charges being brought here.