Provide a detailed linguistic analysis of the semantic evolution for three specific internet idioms: 'lol', 'fail', and 'salty'. Trace their etymology from their origins in early internet subcultures (e.g., IRC, Usenet, gaming forums) to their current usage in mainstream social media (Twitter/X, TikTok). For each idiom, analyze the changes in: 1) Grammatical function (e.g., from interjection to adjective), 2) Connotative meaning (positive/negative/neutral), and 3) The sociological factors that drove their adoption or decline. Conclude by predicting the lifespan of these terms in the next decade based on current linguistic trends.