Tostitos was introduced in 1979.
In September 2003, the owner of Tostitos, PepsiCo, changed the logo so that the t's are people sharing a chip with a bowl of salsa that serves as the dot of the i.
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In December of 2012, PepsiCo tweaked the Tostitos logo. The chip between the two t's are now vertical and the logo now resembles their past logos.