Web 2.0: How to use them and Can Interlink?

I want to know can we interlink our web 2.0 sites and Creating a web 2.0 site with only 1 page for linking to money site can it be dangerous?

Or should we just create a few filler content and then get a link.

Also is it necessary to build links to Web 2.0s?

Using web 2.0s can never be dangerous unless you use copied/poor contents - I would suggest to keep updating your web 2.0s with fresh contents (rather than one page content) and keep linking to your money site. Adding fresh contents with links pushes both itself and your money site up. Of course, You can power up your web 2.0s by building backlinks to them but it is not necessary - it has/builds its own power.

Best to use multiple paged web2.0s and consider them as your real sites for secondary traffic source. Interlinking is fine but best avoided as you could build tiered links to your 2.0s.

Try to build a review site for your Money site and send some back links to money site and some to review site..

Its always better to create multi paged ones and interlink them.

If you have budget, I also sometimes add content to existing web 2.0s and power them up with links. Works well.

Definitely, not dangerous.