Hot topics like Target's data breach and fast fashion are scattered in our list of this week's most read stories on Retail Dive. Trends like Millennial shopping and m-commerce also fall into the ranks, as well as a run down of the top 6 retail tech companies to follow on Twitter. Read on for the complete list:

• 6 retail tech companies to follow on Twitter: These are the important accounts to follow for news on retail technology.
• Target says it ignored suspect activity that led to data breach: In its annual report and elsewhere, the retailer details some of the fallout of last year’s cyberbreach.
• Millennials redefine loyalty: Widely seen as less brand loyal compared to previous generations, Millennials may just have different expectations.
• M-commerce surging: Mobile shopping now accounts for almost a quarter of e-commerce sales.
• Whither fast fashion?: The cheap, trendy clothes of fast fashion are the go-to choice of budget-minded teens, and increasingly, for retailers. But, like the clothes themselves, that may not last.

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