LinkedIn is an interesting platform which allows you to connect with professionals. But here’s a feature you might have missed all the time & might be quite interested to look into.
When a member sends you a LinkedIn invite, do not assume that you are always going to get it. Or if you want to send someone a LinkedIn request, don’t assume they might have not added you cause they might have not logged in or they do not want to. It’s the dirtiest kept secret by LinkedIn which puts an auto-filter to your invites & the reason behind this could be that they expect you to upgrade to a gold member if you are really serious about connecting on LinkedIn.