Installing Buddypress on a subdomain, linking to main site

I’m looking to build a community around the content on my website, and I’m wondering if I install Buddypress on a subdomain like community.mainsite.com, if the activity on the main site can/will filter into the stream on the subdomain and, likewise, if the activity in the community area will reach the main site (i.e. can users post to the main blog via one quick post in their buddypress profiles, will their posts on the main site show up their profiles, etc.).

Before I do anything, I want to make sure that I’m not going to be limited by installing Buddypress on a subdomain, rather than installing it on the main site.

Any help would be appreciated. Thanks.