Salams

Bismi llāh, wa l-ḥamdu lillāh, wa ṣ-ṣalātu wa s-salāmu ‘alā rasūli llāh, wa ‘alā ālihī wa ṣaḥbihī wa man wālāh

Merely typing "salam" does not fulfill the sunnah of giving the Islamic greetings of peace. When you type "salam", all you're saying is "peace". It wouldn't really make sense if someone came up to you and just said, "Peace," would it?

So when greeting others, type in the full "al-Salamu ‘alaykum". (You can use your phone's text expansion settings to ensure you don't have to type the whole thing every time.)