I tend to be generous with votes if I like specific posters and want to encourage them. I like to assume that's ok, but is there an official take on that?

And what about people who are likely to share an IP address with me? I'm on a small node with fewer than 200 users, and at least 2 or 3 come here (got invited by one). I don't necessarily know them but will that look like alt accts boosting votes? Is there a whitelist or something like that for verified individuals on the same address maybe?