Some great suggestions from @ConversationAge
1) Take notes in the back of the business card about where you met that person and what you talked about, then enter them in your electronic database with their contact information
2) Follow up with people right after an event, while the energy from the experience is still high, and it’s likely they’d remember it if not you
3) Share resources like articles, posts, links, and connections to other people as part of your follow up. Generosity gets you started on a good and memorable footing.
4) Develop a system to keep track of when you touch base with people after the initial contact. Things tend to drop off as time goes by, so documenting the time frame is helpful.
5) Track what you share, or enter notes of the kind of things that person is interested in or is working on, just like you did when you were looking for your first job or the next gig.
6) Revisit your database or address book periodically to follow up with people you may not have heard from or talked to in a while.
7) Make it a habit to share with that person special content, leads, helpful things as you come across them. Habits are habit-forming and will allow you to keep the momentum going.