No, you cannot add someone as your friend at the Official MindStick page, whereas you can Follow each other for the notification updates regarding any post, article or any content shared by them.
Till now MindStick doesn't provide such facilities of making friends and having a chat or conversations with any other users, MindStick is a professional platform and things goes professionally here. So if incase you need to
Contact any user then the user must have upgraded his/her profile, then after he/she can update their contact details. MindStick takes excellent care of the privacy of their users, so MindStick doesn't reveal e-mails, contact, and personal details of any user. MindStick allows numerous options and details to submit when you make your profile, but all the details are not public for everyone by default, if you need you can make it public later by Upgrading your account.