Seeing as there is no on-site messaging on this board, we basically have to use a contact that is either provided in a thread; or a contact that is provided in a member profile.
If you are going to contact a member via KIK, email or another messaging option, it would be appreciated if you could provide some information. I.e. "Hi" and "hey" most usually will be ignored.
Some basic information would be: WHO you are (membername or something else); WHY you are contacting (i.e. topic, or profile info, general question etc); WHAT you are (male, female, couple, trans, gay, bi, straight, pan etc.) and What you are into.
If you are really thorough you can add When (availability) and Where (Steamworks of course)
It is noted that a lot of people contacting members are not Steamtalk members themselves and have no profile to share.
A little bit of thought going into this messaging will go a long way.
Cheers.