Predictive text for facebook

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Recently I started a group predictive text for facebook. I think this would be fab if the computer allerted us to typos in text. Maybe prehaps annoyingly so there could be a siren sounded when mistakes are hit. Perhaps in order to create a lesser annoyance factor the siren could sound just at the point of pressing the submit button. The problem with mylot is not being able to type into work before the 1st 100 or is it 500 posts and so typos are likely to be higger. I do not see how this is user friendly!