In order to avoid this happening, be extremely cautious in how much information you're giving out, and make sure you don't use the same username across services (see the first paragraph in this article for a quick review!).
Iji zere nke a na-eme, jiri nlezianya kpachara anya maka ọtụtụ ozi ị na-enye, jidekwa na ị gaghị eji otu aha njirimara na-agafe ọrụ (lee paragraf mbụ na isiokwu a maka nyochaa ngwa ngwa!).