The question on the form is:
" Do you have, or have you had, close and/or continuing contact with a foreign national within the last seven (7) years with whom you, or your spouse, or cohabitant are bound by affection, influence, common interests, and/or obligation? Include associates as well as relatives, not previously listed in Section 18."
I don’t think a few texts to someone who lives in another country counts as 'close and/or continuing contact". Even FB friends who not citizens whom you simply follow on social media but don’t have “close contact” probably wouldn’t qualify. If, however, you transact business or regularly communicate with foreign contacts through any means (in person, phone, text, email, etc.), you probably should list it and then let the investigator ask what they feel is necessary.