The word touchscreen 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: 21
Highest Scoring Words With Friends™ Play In The Letters touchscreen
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Seven Letter Word Alert: (55 words)
cenotes, censure, centers, centres, chouser, coerces, coheres, concert, conches, concurs, cornets, couches, counter, creches, crochet, echoers, encores, encrust, enthuse, estrone, etchers, heteros, hornets, hunters, necrose, neuters, notcher, notches, octenes, rechose, recount, rehones, rehouse, retches, retouch, retunes, scenter, scouter, screech, scrunch, shorten, shouter, shunter, tenures, thereon, thrones, tonsure, torches, toucher, touches, trochee, trounce, unerect, unhorse, unreset