Community is a side effect of stuff that people actively care about. This can be real-world proximity (as in physical communities) or social connection among relatives and acquaintances (as with Facebook friends), or deep involvement in some community of practice (as with HN or the niche subreddits that are most strongly identified with Reddit itself). You aren't going to find a real "community" feel on the Reddit.com front page, least of all on the algorithmically-driven "new" Reddit.com. It's just as silly as expecting "community" on 9gag or Twitter.