No, don't do that... go the extra few steps and make separate Web 2.0s for each of your sites and build them out.
Let each individual Web 2.0 support one site only.
Actually, if all three sites in same niche gets backlinks from a single page will alert google. so, your sites may get hit in algorithmic updates.any reason why it should only support one site?
any reason why it should only support one site?