Spreading FUD all over, aren't we?
First, Skype is not, and has never been, Israeli. ICQ hasn't been Israeli for ages and ages (sold to AOL, that's America Online) in 1998. That's 17 years ago. Either way, a search for "ICQ snowden backdoor" shows nothing relevant in any of the first 10 results, causing me to question the validity of trusting you as a source. If I'm wrong, by all means, please do provide sources.
Second, I used to be in charge of Check Point's product security (late 2000 to early 2003). If any Israeli product is backdoored, you'd expect Check Point's Firewall-1 to be it. In order for that to work, I'd need to know about it, or I might accidentally close the back door. I give you my word as a non-anonymous long time user of this site that no such intentional back doors exist in the product. I have never been asked to not fix a problem I've found, or to not look for certain types of security problems.
During my time there, a few security problems were found in FW-1. If memory serves me right, most were in the management and not in the actual enforcement unit. Either way, I have never seen such a problem and thought "this seems intentional". They always seemed like no more nor less than the usual sloppy programming creating security holes.
Israel has a notorious "cypher law". I actually did produce an encryption product. I only registered it after several years in which it was freely available through sourceforge. The registration process included me sending a request with links to the web site, and a reply saying it was approved as a "free encryption device" (i.e. - I do not need to re-validate it unless I change the crypto).
Now, I know the usual FUD about rsyncrypto, and I know people will say that that's because rsyncrypto's encryption sucks to begin with. All I can say about that is that the cypher law makes it legal to use freely available encryption from the internet without restriction (i.e. - gpg, ssh etc.). They also list the number of applications they processed and denied, and the last time they denied any application was around 2002 (I cannot find the page right now, sorry).
So, all in all, I think this:
i never seen anything come out of israel that wasnt backdoored.. Icq skype etc
i think showden files had things about this also
is concentrated bullshit.