This one is my favourite too. I think people often just feel a number and not important. So if you take that small amount of time to contact them and make a connection, they feel that they matter to you.
I've found that you don't need to make a big deal with most people - a simple and meaningful contact can be a great step in building that relationship. I contact many blog owners and website owners each month and there are two things that really stood out to me-
1 - the number of blog owners who have no way for people to contact them
2 - how few actually respond - not even an "I'm not interested"
Neither of those things are good ways to make a decent impression on others. I'm not even asking for a detailed answer - just click "reply" and say - "I'm not interested". I do a lot of that and it doesn't take a minute.