Twitter is taking steps to tighten account security for a range of users ahead of the US presidential election, including by requiring the use of strong passwords. “We’re taking the additional step of proactively implementing account security measures for a designated group of high-profile, election-related Twitter accounts in the US. Starting today, these accounts will be informed via an in-app notification from Twitter of some of the initial account security measures we will be requiring or strongly recommending going forward,” it said in a blog post announcing the pre-emptive step….