The word socialiser is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (37 words)
airless, calorie, carless, celosia, closers, coalers, coalier, coalise, cresols, eclairs, escolar, laicise, lassoer, liaises, lossier, oarless, oracles, ossicle, reclass, recoals, recoils, resails, resoils, rosalic, sailers, sailors, scalers, scalier, scleras, scoriae, scorias, serials, silicas, slicers, socials, solacer, solaces