Bango, a mobile payments and analytics provider, has signed an agreement to provide payment services to Facebook, the worldwide social networking site. The terms of the agreement are not being disclosed, the firm said, because the board believes it is too early in the relationship to accurately forecast the level of business which it may generate.Just last month the company signed an agreement with Amazon to provide undisclosed services. The share price 37.06% to 135.00p by 12:27. NR