Welcome! Glad to have you in the community!
I too came from Reddit seeking another link aggregator and instead I found a wonderful, warm, welcoming, and conversational community. This place is, IMHO, so much better than Reddit ever was (even before the great Digg migration!). There are some really key differences between Snapzu and Reddit and I found that some of them were less than obvious so here are some things that might help:
1. Ask lots of questions. People here are happy to help, don't be afraid to ask.
2. Read through the FAQ and the Site Rules to get a good feel for how the site operates and what guidelines you should follow.
3. Be active. One GOOD thing we can bring with us from Reddit is our participation and original content. Start messing around with "snaps," and get involved in some of the tribes here, we can really add a lot of content if we all start contributing :)
Thanks for saying hello!