Hello ildomandatore
Thank you for your interest in PeepSo. Let me try to shed some light on the doubts you have.
1. Theme
You can use any theme you want. It is not mandatory to use our Gecko theme.
In most basic terms, PeepSo is no different than any other plugin for WordPress and that being said, it works on any theme of your choice.
2. Social Network
PeepSo does not hijack your WordPress site. It will still be the same website you created, with all the features that you might have, and everything will work just as fine as it was working before installing PeepSo. You will still have your blogs, your e-commerce if you use it, or whatever plugin you had installed before adding PeepSo.
Installing PeepSo will simply add Social Network elements to your site, for example, all users in the database will get their own Social Network profiles, activity streams, and if you opt for paid bundles, friends system, photo and video galleries, groups etc.
In any case, you can always create the staging version of your current site and install free version of PeepSo on it to see how it will look.
I hope that answers your questions. If you have more, please consider joining our own community on our site as we rarely monitor this forum and there are better chances you’ll get your answers faster on our site, even during the weekend.