My recent experiment with 64 Web2.0 shows that none of them is get indexed after 2 weeks even using one of the best paid indexer service. So please don't waste your time on web2.o My one Friend already mentioned the same on his group but I think to give a try and i created 64 web2.0 using good content but somehow none of them is not indexed I didn't use wordpress & blogger since I still believe they should be buffer site, not to use them as web2.0 as they have more worth than a mere backlink All web2.0 was do follow and normally my ******** web2.0 in past get indexed in 24 hours using the service I am having. So guys better to focus on quality content, interlinking of your website and social sharing. Thats all you need For backlinks, use good PBN and Guest posting, still they works. Should you use Web2.0 ?? Yes use thme for diversification purpose only. Don't use them as your major backlinking strategy. They don't likely to be best to rank your sites now as they were before. But don't exclude them at all. Just have them in your backlinking profile targeting your general anchor.