OP, I would say it's not like web20s don't work, is more like your list have beed overused and that's why you're not getting any results, try finding some new web2.0s and check if you'll be getting results again
theoretically yes but in reality, not all backlinks are shown, whenever you use ahrefs majestic or gwt there are always some links that ain't showing, and if those links are spammy, domain could be banned, but let's hope this is not the case :)
as it was said, you need to wait for PR update, but I wouldn't concern so much about it it's not the same PR it was 2-3 years ago. about backlinks, if you really want a very quality source of links you really would need to create your own list of sites where you can post them. But for starters...
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