Answers: Nope, it just funds they put their public *search* settings to "Only my friends." Their name is within black so that it's not a clickable link. Only THEY can add on people as friends, unless you hold their email address and search your email contacts. If you try to investigate for them, they will never show up and you also won't be able to see their entitle on your friend's friend list.
Yea that or they put you on their give the brush-off list.
Where is the mark located?
Is it on the public search catalogue? If so they put it in private and predetermined people into seeing their actual profile.