If the job is for what I'm doing now (iOS development) vs something I did five years ago I'll respond with a quick "I'm not looking to make a move right now but

If the job is for what I'm doing now (iOS development) vs something I did five years ago I'll respond with a quick "I'm not looking to make a move right now but check back in n months or years." It takes about a minute and it does not hurt to have a pipeline of people with opportunities. It's also a good way to weed out the crappy recruiters because if they have their stuff together at all you will usually hear from them again in n months. I also do this so I have a record of who contacted me and if I think they are at all interesting. I usually don't refer them anyone and I usually don't connect with them unless I've worked with them in the past.