Well, among other things, he revealed that:
1) The NSA intercepts and stores virtually all communications sent on electronic networks anywhere it can reach. Not just metadata. In the case of phone calls, they also speech->text them and make that archive searchable.
http://rt.com/news/172284-nsa-...
http://www.globalresearch.ca/n...
http://www.theguardian.com/wor...
2) The NSA constantly works at ways to break into encrypted communications, including hacking into the VPNs of supposedly friendly governments.
http://www.spiegel.de/internat...
3) The NSA listens to the cell calls of friendly foreign leaders. (hopefully, also, unfriendly ones).
http://www.spiegel.de/internat...
4) The NSA may have worked to weaken encryption standards in order to make their task easier.
http://www.theverge.com/2013/9...
http://www.scientificamerican....
5) The NSA has physically broken into the fiber plants of major public Internet companies (ie. Google), supposedly without their knowledge, in order to steal data sent only internally.
http://www.extremetech.com/int...
6) Major Internet companies, and all telcos, have willingly shared much or all of their client's communications with the NSA.
http://www.bloomberg.com/bw/ar...
7) The NSA and foreign intelligence agencies share data in order to evade domestic spying restrictions.
https://www.techdirt.com/artic...
8) The NSA has hacked into at least one major supplier of SIM cards, in order to spy on calls made from the phones made with them.
http://news.softpedia.com/news...