I know tier 1 is best to be made manually on web 2.0s. But what about tier 2 and tier 3? Would like everyone's opinions on this.
I agree.It depends what you put into your tiers, whether context backlinks or something else.
If backlinking, start with Scrapebox. Find your relevant sites according to the footprint you need and then create those with macro, semi-manually, and from there you can also comment. Scrapebox is pretty much the best thing. It's more of an internet tool than just IM tool and I use it regularly in my day to day, it's nuts.