Just a friendly reminder: the two-week Give One Get One OLPC promotion got under way today, which means you have until November 26 (should you be a resident of the U.S. or Canada) to plunk down $399 to purchase an XO laptop for yourself while donating another to a child in a developing nation. If you want yours by the holidays, it's probably best to act sooner than later; OLPC doesn't guarantee delivery in time for the holidays but states your odds are greater the earlier you order. Two other notes: you can write off $200 of the order, and T-Mobile is throwing in a year of free HotSpot access for U.S. participants.
Twitter attempts to beef up security
Twitter lets users add a second layer of password protection, Jennifer Lopez has a new mobile brand, and Nextdoor brings text alerts to the neighborhood.